Mounting for rock drills



Patented Feb. 6 1945 UNITED STATES PATENT oFF-ICE MOUNTING FOR ROCK DRILLS Paul A. Lincoln, Bloomsbury, N. J., assignor to Ingersoll-Rand Company, New York, N.

" a, corporation of New Jersey Application March 27, 1943, Serial No. 480,727 3 Claims.Y (Cl. 25,5-51) This invention relates to rock drilling mechanism, and more particularlyvto a mountingjor rock drills of the hand-held type to enable such rock drill to be used as a drifter.

One object of the invention-is to expedite the operations of attaching the rock drill to and releasing it from the mounting.

'Another object is to avoid the need of special tools for connecting the mounting to the rock drill.

Still another object is to enable the mounting t be connected to the rock drill with a minimum of manual effort.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawing accompanying this specica tion and in which similar reference numerals refer to similar parts,

Figure 1 is a side View of rock drilling mechanism having the invention applied thereto,

Figure 2l is an end view of the rock drilling mechanism, i

Figure 3 is a transverse view taken through Figure l on the line 3-3,

Figure 4 is a plan view taken through Figure 1 on the line 44, and

Figure 5 is a perspective view of a detail.

Referring more particularly to the drawing, 2U designates a rock drill, 2! a shell, and 22 a feed screw for actuating the rock drill longitudinally of the shell 2| in order to maintain the rock dril-1 in the correct driving relationship with a working implement (not shown) which it is intended to actuate.

'Ihe rock drill 20 is illustrated as being of the type that is intended to be held and guided by an operator during the drilling of a hole and accordingly has a lug or lugs 23- at its rearward end to accommodate a handle (not shown) whereby the rock drill may be gripped When used as a hand-held tool. In order to enable a rock drill of the latter type to be mounted upon the she]1 2| so that it may be fed to and from the work by the feed screw 22, in the manner of a drifter, said rock drill is provided with a saddle 24 that is connected to the drill and threadedly connected to the rfeed screw so that the latter may be used to move the drill longitudinally of the shell 2 I.

The saddle 24 comprises a plate portion 25 having ribs 26 extending along its side edges to slide within grooves 21 in the inner-surface cf the shell 2|. On the upper surface of the plate 25, near the front end thereof, are a pair of hooks 28 the inner surfaces 29 of which are shaped to conform with the contour of ears 30 on the casing olf the rock drill 20 that extend loosely into the hooks 28 for maintaining the intermediate and front portions of the rock drill in the correct operative position with respect to the shell.

At the opposite end lof the plate 25 is a cross piece 3| having a groove 32 in its forward surface to receive the rearward sides of the lugs 23. The cross piece 3| is, moreover, provided in its end portions with apertures 33 that extend longitudinally of the saddle to receive, slidably, locking members 34 adapted to lock the lugs 23 to the cross piece.

'I'he locking members 34 may be freely rotatableV within the apertures 33 and are shown as being inthe form of hook bolts, the curved or hook portions 35 of which engage the forward surfaces 3B of the lugs 23 or, as shown, depressions 31 in the surfaces 3B to receive the ends of the hooks 35.

The locking members 34 are of such length that considerable portions thereof extend rearwardly of the cross piece 3|, and on such rearwardly extending ends of the locking members are compression springs 38 that act against the lugs 23 and against nuts 39 on the members 34 for holding the hooks 35 normally in the depressions 31 and to hold the lugs 23 against the cross piece. The springs 38 are of suitable strength to hold the lugs 23 rmly seated in the groove 32 unaffected by the severe vibration to which the drilling mechanism is subjected during operation, and the force of the springs may be convenientlyvaried by adjusting the nuts 39 upon the locking members 34.

Owing to the heavy pressure of the springs 38v required to prevent vibration of the rock `drill relatively to the cross piece 3|, it would be difllcult to apply suiflcient'pressure by manual force directly to the locking members 34 to cause them` ,to slide through the cross piece for disengaging` the hooks 35 from the rock drill. It would, -moreover, be inadvisable to unthread the nuts 39 for minimizing the pressure of the springs38 each time it is intended to connect or ldisconnect the saddle to or from the rock drill, since then much time would be consumed to so adjust, the nuts 39 that each one of a number of springs 38 would be loaded in the same degree.

It is, accordingly, contemplated to use'the force that may be exerted by means of Athe feed screw 22, and its actuator, as for example a crank 40, for compressing the springs 38 and to cause relative sliding movement between the cross piece 3| and the locking members 34. To this end abutment means are placed in the path of movement 2|, as is customary.

The free ends 44 of the wings lvl: terminate' inl rods 43 secured to the opposite sides of the shelly the longitudinal planes of the locking members surfaces 45 ofthe locking members 34 engage. v

34 in such'position that When the rearward end'.

the wings 4l the locking members 34 will be restrained against movementy inv a rearwardly direction.

Tne operation of the device is as follows:` Wlrlenlevervity is intended; tor place. a: rock' drill' 2U onf theImounting. ther-saddle'l 2'4 i'srst'movedf to ai rearward 'positioniby means of the feed screw '22" to bring; the ends 45f of the lockingmembers 34'* against the wings 4L Upon furthermovement of' thersaddle ina rearwardly' direction the l'ock-g ing members will remain stationary"and'thespace` betweenl the hooks 35 and the groove 32 Will be enlarged sui'ciently to permit the"lugs"23 t'o be placed inthe groove 32', it; being assumed; of course, that thev ears 30' have previously; be'err placed in the hooks 28. 1

The feed's'crew' 2:2' is'then rot'ated in the opposite-hand direction t'o move the saddle' 24' forwardly'and thereby' releasel the pressure of'the cross piece 3l upon thesprings 38. The-springs will then move the locking members to place the hooks y in engagement with the depressions 31 for locking the rearward end of the drill to the saddle. i

I claim:

1. A mounting, comprising in combination with a rock drill and a shell, a saddle for the rock drill slidablein the shell, lock-ing ymeans to lock the rock drill. to'- the saddle. and abutment means supported by the shell in a position to engage and release the locking means from the rock drill during a portion of the movement of the saddle in the shell 2.,. Amounting, comprising in combination with anrockldrill anda-shell, a saddle for the rock drill having'. meansV tofengager a portion of the rock drill and beingsliydable in the shell, locking means for 1ockinganother'portion of the rock drill to the saddle? and being slidable in the saddle, means for normally holding said locking means in lockingi position; and meansf supported bythe shell positioned to engagey andholdithelocling means stationarydur-ing' a portion off the' movementof the saddle in the shell fo'r releasingthe'rocl' drill from the locking means.

3. A mounting, comprising in combination with a rock drill and a shell', a-saddlefor'ther'ock drill having means toA engage` a' portionV of` the" rock drill and lcei'ngH slida-ble'I inf the'` sliell, springpressed jaw means on the saddle to grip another portion of the rock drill", a-nda stationary'member supported by the shell to abut and'open'sa'idjaw means during a portion of the slidingl movement' of the cradle relativelyto"theshellforreleasing the rock drill. f

A. LINCOLN. 

